Postfix is fast, easy to administer, and secure. The outside has a definite Sendmail-ish flavor, but the inside is completely different.
Postfix runs on AIX, BSD, HP-UX, IRIX, LINUX, MacOS X, Solaris, Tru64 UNIX, and other UNIX systems. It requires ANSI C, a POSIX.1 library, and BSD sockets.
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